bot.py: Add shortcut method reply_media_group (#994)

fixes #936

.gitignore

@@ -40,6 +40,7 @@ htmlcov/
 .coverage
 .coverage.*
 .cache
+.pytest_cache
 nosetests.xml
 coverage.xml
 *,cover

AUTHORS.rst

@@ -51,6 +51,7 @@ The following wonderful people contributed directly or indirectly to this projec
 - `njittam <https://github.com/njittam>`_
 - `Noam Meltzer <https://github.com/tsnoam>`_
 - `Oleg Shlyazhko <https://github.com/ollmer>`_
+- `Oleg Sushchenko <https://github.com/feuillemorte>`_
 - `overquota <https://github.com/overquota>`_
 - `Patrick Hofmann <https://github.com/PH89>`_
 - `Pieter Schutz <https://github.com/eldinnie>`_

telegram/message.py

@@ -468,6 +468,26 @@ class Message(TelegramObject):
 
         return self.bot.send_message(self.chat_id, *args, **kwargs)
 
+    def reply_media_group(self, *args, **kwargs):
+        """Shortcut for::
+
+            bot.reply_media_group(update.message.chat_id, *args, **kwargs)
+
+        Keyword Args:
+            quote (:obj:`bool`, optional): If set to ``True``, the media group is sent as an
+                actual reply to this message. If ``reply_to_message_id`` is passed in ``kwargs``,
+                this parameter will be ignored. Default: ``True`` in group chats and ``False`` in
+                private chats.
+
+        Returns:
+            List[:class:`telegram.Message`]: An array of the sent Messages.
+
+        Raises:
+            :class:`telegram.TelegramError`
+        """
+        self._quote(kwargs)
+        return self.bot.send_media_group(self.chat_id, *args, **kwargs)
+
     def reply_photo(self, *args, **kwargs):
         """Shortcut for::
 

tests/test_message.py

@@ -291,6 +291,20 @@ class TestMessage(object):
                                   reply_to_message_id=message.message_id,
                                   quote=True)
 
+    def test_reply_media_group(self, monkeypatch, message):
+        def test(*args, **kwargs):
+            id = args[1] == message.chat_id
+            media = kwargs['media'] == 'reply_media_group'
+            if kwargs.get('reply_to_message_id'):
+                reply = kwargs['reply_to_message_id'] == message.message_id
+            else:
+                reply = True
+            return id and media and reply
+
+        monkeypatch.setattr('telegram.Bot.send_media_group', test)
+        assert message.reply_media_group(media='reply_media_group')
+        assert message.reply_media_group(media='reply_media_group', quote=True)
+
     def test_reply_photo(self, monkeypatch, message):
         def test(*args, **kwargs):
             id = args[1] == message.chat_id